Bowed rotor
Hi,
I have few questions regarding bowed rotor on PW 1100 engine. If I am not mistaken this problem was discovered after the engine was certified.
a) Why PW didn't discover this problem earlier?
b) Did Airbus discover this problem before the certification of A320 NEO?
It seems this problem is related only to PW 1100. Assuming this is true:
c) Why other PW geared turbofan engines (PW1200G, PW1400G, PW1500G) don't have this problem?
I understand that aircraft and engines manufacturers usually issue service letters or bulletins after the aircraft is certified.
d) Can you mention examples where aircraft manufacturers (Boeing, Airbus, ...) or engine manufacturers (PW, GE, RR)
missed to discover major problem(s) on time (after certification). Please be specific by mentioning the system/subsystem... on aircraft or engine/APU.
Thank you.